Camera Module Shield-Can Convex-Concave Contact Surface
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Solution Overview
Problem
Conductive bonds in camera modules increase electrical resistance, reducing the efficiency of electromagnetic wave shielding, which can lead to communication problems and malfunctions.
Innovation Solution
A camera module design featuring a shield-can with a convex-concave or protruded contact surface that directly contacts the ground pad, bypassing the conductive bond to reduce electrical resistance and enhance electromagnetic wave shielding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive bond is used to electrically connect the shield-can to the ground pad, then the shield-can can be connected to the ground pad, but electrical resistance increases and electromagnetic wave shielding efficiency decreases
Solution Approach 1:
The invention extracts the harmful conductive bond from the electrical connection path between the shield-can and ground pad. By removing this intermediate layer, the patent achieves direct metal-to-metal contact, eliminating the source of electrical resistance while maintaining the grounding function.
Solution Approach 2:
The contact surface of the shield-can is designed with an asymmetric convex-concave structure that complements the corresponding concave-convex structure on the ground pad. This asymmetric design ensures precise alignment and direct contact between mating surfaces, maximizing electrical conductivity while minimizing contact resistance.
2Reliability
If a conductive bond is used to connect the shield-can to the ground pad, then electrical connection is established, but the shielding efficiency is reduced due to increased electrical resistance
Solution Approach 1:
The conductive bond is completely removed from the connection structure. The patent replaces this intermediate material with a direct mechanical and electrical connection between the shield-can contact surface and the ground pad, simplifying the overall structure while improving performance.
Solution Approach 2:
The contact surfaces feature convex and concave curved geometries that facilitate precise mating and alignment. The convex portion of the shield-can fits into the corresponding concave portion of the ground pad, ensuring reliable direct contact without requiring additional bonding materials or complex alignment mechanisms.
3Reliability
If a convex-concave contact surface is used to directly contact the ground pad, then electrical resistance is reduced and shielding efficiency is improved, but the contact surface design becomes more complex
Solution Approach 1:
The convex-concave contact surface design uses asymmetric complementary geometries that are simple to manufacture. The convex portion on the shield-can mates with the concave portion on the ground pad, creating a unique fit that ensures proper alignment and direct electrical contact without requiring complex machining or multiple components.
Solution Approach 2:
The curved convex and concave surfaces provide mechanical compliance and tolerance compensation. These rounded geometries are easier to manufacture than sharp edges or flat surfaces, as they naturally accommodate manufacturing variations while ensuring consistent electrical contact across production batches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves electromagnetic wave shielding efficiency by decreasing electrical resistance, thereby preventing communication issues and malfunctions caused by electromagnetic interference.
Implementation Method 1
A convex portion of the contact surface of the shield-can may penetrate through the conductive bond and directly contact the ground pad
Implementation Method 2
a shield-can coupled to the housing and enclosing an outer surface of the housing
Data Source
AI summary
There is provided a camera module including: a lens barrel including at least one lens disposed on an optical axis; a housing having the lens barrel disposed therein; a circuit board disposed below the housing; and a shield-can coupled to the housing and enclosing an outer surface of the housing, wherein the circuit board is provided with a ground pad, and a contact surface of the shield-can contacting the ground pad is formed to have a convex-concave shape.